Reading Diagnostic Trouble Codes

MALFUNCTION INDICATOR LIGHT (MIL)
The check engine light operates to warn the driver of failure in the following systems:

^ Air flow sensor system
^ Water temperature sensor system
^ Car speed sensor system
^ 02 sensor system
^ Knocking sensor system
^ Fuel injector system
^ Micro computer

DISPLAYING CODES

Fig. 3 Diagnostic test lead location.:

MIL Test Jumper:

1. Connect diagnosis leads (in the vicinity of the control unit) as shown.

MIL Lamp:

Fig. 5 Light pulse indications & trouble code identification.:

2. Turn Ignition switch to ON position. The trouble code stored in memory is displayed in the check engine light. Two pulses followed by a short time lapse, then three pulses would indicate a code 23 and so on.

3. Maximum of three trouble codes are storable in memory and will be displayed in numerical sequence.

4. If only one trouble code is stored, the code will repeat continuously until test leads are disconnected.

5. If more than one trouble code is stored, each code will repeat three times, starting with the lowest, then proceed to the next code.

6. After all codes have been shown, the pattern will repeat itself.

7. Each trouble code is displayed three times before moving to the next code. This action will be repeated as long as the diagnosis lead is connected with the ignition switch turned to ON position.